SNVA406C May   2010  – January 2022 LM27402

 

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8 Setup Procedure

  1. Set the input power supply voltage to 12 V. Adjust the input supply current limit level to 10 A to protect from any unanticipated shorts.
  2. Turn the input power supply off. Connect the input supply positive terminal to the VIN terminal and the input supply ground terminal to the GND IN terminal.
  3. Turn the output electronic load off. Connect the electronic load positive terminal to the VOUT terminal and the ground terminal to the GND OUT terminal of the LM27402 evaluation board.
  4. Turn the input supply on. The part will self enable and the output voltage should be 1.5 V. Slowly increase the load current to 20 A. The input voltage can now be adjusted as well.
CAUTION: If the input voltage is below 5 V, the internal LDO will be in a drop out state. The output of the LDO provides the driving voltage across the gates of the MOSFETs. If the voltage at VDD decreases enough, the efficiency can suffer if the MOSFETs are not fully enhanced in the on-state. The output should maintain regulation.